If it is gas, you might of reversed the hot and colds and not realize, meaning, that the house pipes are wrong and they switched the dip tube on the tank on the tank before.
If electric, sounds like it is only heating at 110 instead of 220, and if it is a State water heater, you MUST tie black-blue-black (3) together as one, and yellow-white together.
You could also of pushed the dip tube down inside of the tank. GE (Rheem) is having problems with the dip tubes falling inside of the tanks.
“Your best interest is secured by making the right decisions the first time.”